In the end, it's a game, so it won't matter if that word is not included.In the end, it is a game. It will not matter if that word is included. I like the fact that you care about your students. But I think you are severely overestimating the impact of a word, out of the thousands of pictures, words, and non-verbal signals these students receive daily.
I say that jokingly. It matters to you and others who would like to include attractiveness in the definition of Charisma. Perhaps you can take into account that it matters to other people, too, who would like to exclude it? Use it at your own table while keeping it out of the official rules?
In view of the pervasive influences that we're all steeped in, I suspect the effect of adding a word where it wasn't before would be as detrimental or more than having the word there in the first place. We've got a tiny space where attractiveness is not measured and scored, and that's getting taken away by a very deliberate act.